Is the Walmart-brand stacking rainbow a reasonable alternative to Grimms Rainbow? No, but it isn't all bad either and is probably worth the $5 dollars if you're on a budget.
Here is a summary of the pros and cons:
Cons:
Made of hollow plastic
Slippery and not grippy
Not as stackable/versatile as the wooden rainbow
Pros:
Durable
Has 7 colors of the rainbow (ROYGBIV)
Colors are in the correct order
Is self-corrrecting (error is clearly evident)
Good for open-ended play
Can make some basic configurations
Verdict: Yes, get it if you're on the budget
If you're not on a budget, save up for the Grimm's. It's an interactive piece of art that will continue to bring beauty and interest to your home long after your children grow up.
Here's an affiliate link to the "original" Grimm's Rainbow for $101 on Amazon Prime:
https://amzn.to/2JQqqmz
If you still want a wooden stacking rainbow but don't want to pay the Grimm's price, check out the "Aoile Rainbow Stacker" for $46.99 on Amazon Prime (affiliate link):
https://amzn.to/2JPWzun
Stacking rainbows are enjoyable for children 18-24 months, but children younger or older can get a lot of enjoyment from it, too.
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